Periods characterized by very high levels of speciation are called adaptive radiation.
Adaptive radiation is a period when there is a rapid increase in the number of species characterized by rapid ecological and morphological diversity with a common ancestor. Adaptive radiation is part of the theory of descent with modification, although it expresses evolution in closely related forms and not in novel designs.
Selection of different habitats can cause changes in anatomy and physiology, even groups of organisms that live in the same habitat but different food choices can also cause anatomical and physiological changes in the bodies of these living things.
Learn more about adaptive radiation at:
https://brainly.com/question/1349313
#SPJ4
